Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
It was one of the grandest of political combinations which simultaneously directed the Asiatic hosts against Greece, and the Phoenician hosts against Sicily, to extirpate at a blow liberty and civilization from the face of the earth. The victory remained with the Greeks. The battle of Salamis (274) saved and avenged Greece proper; and on the same day--so runs the story--the rulers of Syracuse and Agrigentum, Gelon and Theron, vanquished the immense army of the Carthaginian general Hamilcar, son of Mago, at Himera so completely, that the war was thereby terminated, and the Phoenicians, who by no means cherished at that time the project of subduing the whole of Sicily on their own account, returned to their previous defensive policy.
Some of the large silver pieces are still preserved which were coined for this campaign from the ornaments of Damareta, the wife of Gelon, and other noble Syracusan dames: and the latest times gratefully remembered the gentle and brave king of Syracuse and the glorious victory whose praises Simonides sang.
The immediate effect of the humiliation of Carthage was the fall of the maritime supremacy of her Etruscan allies. Anaxilas, ruler of Rhegium and Zancle, had already closed the Sicilian straits against their privateers by means of a standing fleet (about 272); soon afterwards (280) the Cumaeans and Hiero of Syracuse achieved a decisive victory near Cumae over the Tyrrhene fleet, to which the Carthaginians vainly attempted to render aid.
This is the victory which Pindar celebrates in his first Pythian ode; and there is still extant an Etruscan helmet, which Hiero sent to Olympia, with the inscription: "Hiaron son of Deinomenes and the Syrakosians to Zeus, Tyrrhane spoil from Kyma."(2)
2. [A helmet with the inscription Hiarôn ho Deinomeneos i kai toi Surakosioi i tôi Di Turan' apo Kumas was found at Olympia in 1817 (Hicks, No. 15). Elpenor's note, from Gildersleeve's Pindar]
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Reference address : https://www.ellopos.net/elpenor/rome/2-04-fall-etruscan-celts.asp?pg=4